Molecular Biology and Evolution, Vol 14, 619-629, Copyright © 1997 by Society for Molecular Biology and Evolution
SL Adamkewicz, MG Harasewych, J Blake, D Saudek and CJ Bult
A phylogenetic reconstruction based on 506 nucleotides near the 5' end of
the 18S subunit of ribosomal DNA (rDNA) in 2 gastropod, 3 chiton and 28
bivalve mollusks supported the monophyly and sister group relationship of
the subclasses Heterodonta and Palaeoheterodonta but could not confidently
establish either the monophyly or the phylogenetic relationships of the
morphologically well defined subclasses Pteriomorphia, Protobranchia, and
Anomalodesmata. When both gastropods and chitons were included in the
analysis, one or the other invariably emerged within Bivalvia. Some
evidence indicates that this apparent polyphyly may be the consequence of
unequal rates of evolution and of rapid changes in the protobranch and
anomalodesmatan lineages. The taxa usually included in Pteriomorpha emerge
as a grade rather than a clade, although in a sequence that differs from
morphologically based phylogenies.
ORIGINAL ARTICLE
A molecular phylogeny of the bivalve mollusks
Department of Biology, George Mason University, Fairfax, Virginia 22030, USA. ladamkew@gmu.edu
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